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Cytokeratin expression in pilonidal sinus.

I Kurokawa1, S Nishijima, K Suzuki

  • 1Department of Dermatology, Hyogo Prefectural Tsukaguchi Hospital, 6-8-17, Minamitsukaguchi-cho, Amagasaki, Hyogo 661-0012, Japan. ikuro@alles.or.jp

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Summary
This summary is machine-generated.

Pilonidal sinus (PS) shares characteristics with follicular occlusion diseases. Cytokeratin (CK) expression analysis suggests PS epithelium is fragile, hyperproliferative, and undifferentiated, supporting its classification within this disease group.

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Area of Science:

  • Dermatology
  • Pathology
  • Molecular Biology

Background:

  • Pilonidal sinus (PS) is often categorized with follicular occlusion diseases, such as the acne triad.
  • Understanding the pathogenesis of PS is crucial for effective treatment strategies.

Purpose of the Study:

  • To investigate the pathogenesis of Pilonidal Sinus (PS).
  • To evaluate cytokeratin (CK) expression patterns in PS tissue.
  • To determine if CK expression can classify PS within follicular occlusion diseases.

Main Methods:

  • Immunohistochemical analysis of cytokeratin (CK) expression.
  • Utilized six different antikeratin antibodies.
  • Examined nine cases of Pilonidal Sinus (PS).

Main Results:

  • Infundibular-like epithelium in PS expressed CK1, 10, and 14, but lacked CK17.
  • Non-infundibular-like epithelium showed CK14, 16, and 17, similar to normal outer root sheath.
  • CK expression in PS resembled that of hidradenitis suppurativa, indicating fragile, hyperproliferative, and undifferentiated sinus epithelium.

Conclusions:

  • Cytokeratin (CK) expression patterns support classifying Pilonidal Sinus (PS) within the spectrum of follicular occlusion diseases.
  • The findings suggest a shared pathogenic mechanism between PS and other follicular occlusion disorders.